Lenovo T420 Numeric error codes continued, Place the ThinkPad Notebook on a horizontal surface

Table 2. Numeric error codes (continued)

Symptom or error	FRU or action, in sequence
0191	1.	Run the ThinkPad Setup program, and then save
System Security—Invalid Remote Change requested.		current setting by pressing F10.
	2.	System board.
0199	1.	Run the ThinkPad Setup program, and then save
System Security— Security password retry count		the current setting by pressing F10.
exceeded.	2.	System board.
0251	1.	Charge the backup battery for more than 8 hours
System CMOS checksum bad— Default configuration		by connecting the ac power adapter.
used.	2.	Replace the backup battery and run the ThinkPad
		setup program to reset the time and date.
0271	Run the ThinkPad Setup program to reset the time
Real-time clock error. Check date and time settings.	and date.
1802	1.	Remove Mini PCI network card.
Unauthorized network card is plugged in—Turn off and	2.	System board.
remove the miniPCI network card.
1820	Remove all but the reader that you set up for the
More than one external fingerprint reader is attached.	authentication.
Power off and remove all but the reader that you set up
within your main operating system.
2000	1.	Undock docking station or port replicator if it is
Hard Drive Active Protection sensor diagnostics		attached to the ThinkPad Notebook.
failed.Press <Esc> to continue.Press <F1> to enter	2.	Place the ThinkPad Notebook on a horizontal surface.
SETUP		Do not apply any physical shock to the computer.
	3.	Run Diagnostics ➙ ThinkPad Devices ➙ HDD
		Active Protection Test.
2100	1.	Reseat the hard disk drive.
Detection error on HDD0 (Main HDD)	2.	Main hard disk drive.
	3.	System board.
2101	1.	Reseat the hard disk drive.
Detection error on HDD1 (Ultrabay HDD)	2.	Ultrabay hard disk drive.
	3.	System board.
2102	1.	Reseat the Mini SATA device.
Detection error on HDD2 (Mini SATA)	2.	Mini SATA device.
	3.	System board.
2110	1.	Reseat the hard disk drive.
Read error on HDD0 (Main HDD)	2.	Main hard disk drive.
	3.	System board.
2111	1.	Reseat the hard disk drive.
Read error on HDD1 (Ultrabay HDD)	2.	Ultrabay hard disk drive.
	3.	System board.
2112	1.	Reseat the Mini SATA device.
Read error on HDD2 (Mini SATA)	2.	Mini SATA device.
	3.	System board.
2200	System board.
Machine Type and Serial Number are invalid.
2201	System board.
Machine UUID is invalid

44ThinkPad T420 and T420i Hardware Maintenance Manual